Biochemistry Which of the following is FALSE regarding amino acid metabolism? A Histamine is a product of decarboxylation of histidine B Threonine provides the thioethanol moiety for biosynthesis of coenzyme A C Ornithine serves as a precursor of both spermine and spermidine D Serotonin and melatonin are metabolites of tryptophan 💡 Explanation Which of the following is FALSE regarding amino acid metabolism? ✓ Correct Answer: B. Threonine provides the thioethanol moiety for biosynthesis of coenzyme A